Jennifer Lawrence's character struggle

Jennifer Lawrence admits she struggled with wanting to get "darker" in 'X-Men: Days of Future Past'

Jennifer Lawrence "struggled" with Mystique's darker side.

The 23-year-old actress plays the villainous, blue-hued mutant shapeshifter in 'X-Men: Days of Future Past' and she often contemplated going off-script for the darker scenes.

She said: "I was struggling back and forth with wanting to get darker ... There was one scene where I couldn't get past thinking she'd shoot someone where she doesn't in the script. We filmed it both ways, but I don't know which one they'll use."

The actress also gushed about her time working with director Bryan Singer and was delighted when she found out he was going to helm the project.

Quizzed on working with Singer, she told Total Film magazine: "It was amazing! There was a tiny fan boy inside of me jumping up and down and screaming when he decided to direct."

Talking about Singer sharing the experience with fans on Twitter, Lawrence added: "He took pictures of everything. He always had his phone out. He was like a 13-year-old girl at a premiere."

When the mutants of the future face extinction, they send Wolverine (Jackman) back in time to change destiny. The finale is too effects-heavy and non-fans may question whether it all makes sense, but the principal players are all on top form and the slick direction and smart writing are at times enormously entertaining.